1. Safar Center for Resuscitation Research, University of Pittsburgh Medical Center, Pittsburgh, Pennslyvania, USA
2. Department of Critical Care Medicine, University of Pittsburgh Medical School, Pittsburgh, Pennslyvania, USA
3. Department of Environmental and Occupational Health and Pharmacology, University of Pittsburgh Medical School, Pittsburgh, Pennslyvania, USA
4. Department of Surgery, University of Pittsburgh Medical School, Pittsburgh, Pennslyvania, USA